While the 2004 version is known to many to have issues, you take that up with Symantec.
Most of the time I can resolve it by uninstalling NAV, running Symantec's RNAV tool and reinstalling. If not, then it may be another NAV glitch.
When I choose 'Shutdown', Norton Anti-Virus and Internet Explorer don't close properly and the 'Ending Program' box is displayed mid-screen. Any other experiences and any help on sorting THIS problem out, please?